U.S. and Mexican authorities on Thursday confirmed the existence of a clandestine cross-border tunnel between Tijuana and San Diego.
The tunnel’s entrance was found near Tijuana’s A.L. Rodríguez International Airport, said a source with Baja California’s Public Safety Secretariat.
The source said that the tunnel had been in operation, and that an anonymous tip had led Mexican soldiers and members of the state police to its opening at an ice-making business some 300 yards from the U.S. border fence.
Mexican authorities since Thursday morning blocked off access to the business, La Hielera del Aeropuerto, located southwest of the airport on...